Virtual Antenna Synthesis for User-Specific Down Tilt
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Solution Overview
Problem
Current wireless cellular networks lack practical implementation of user-specific antenna down tilt, which is essential for optimizing signal strength and reducing interference, especially at cell edges, due to high digital signal processing costs and significant modifications required in air-interface standards.
Innovation Solution
The method involves synthesizing a small number of virtual antennas using a vertical stack of multiple radiating antenna elements, allowing each user equipment to sense and report optimal down tilt angles, thereby reducing interference and enhancing signal quality through adaptive antenna systems and pre-coding techniques supported by existing MIMO standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If user-specific antenna down tilt is implemented to optimize signal strength and reduce interference, then signal quality and capacity are improved, but computational complexity and digital signal processing requirements increase significantly
Solution Approach 1:
The patent segments the antenna array into multiple virtual antennas, each responsible for specific spatial directions. Instead of processing all antenna elements centrally with high computational complexity, the system divides the beamforming task across multiple virtual antenna entities, reducing the computational burden on the baseband processor while maintaining user-specific down tilt capabilities.
Solution Approach 2:
The patent introduces virtual antennas as intermediary entities between the physical antenna array and the user equipment. These virtual antennas serve as intermediate processing units that simplify the signal processing architecture, enabling user-specific down tilt without requiring complex centralized digital signal processing of all physical antenna elements.
2Productivity
If user-specific antenna down tilt is implemented to reduce interference at cell edges, then capacity and throughput are improved, but modifications to air-interface standards are required
Solution Approach 1:
The patent designs the virtual antenna system to be compatible with existing MIMO standards, allowing the same physical infrastructure to support both traditional MIMO operations and user-specific down tilt functionality. This multi-functionality approach enables enhanced capacity at cell edges without requiring completely new air-interface standards, as the system can operate in both enhanced and legacy modes.
3Adaptability or versatility
If multiple virtual antennas are synthesized from a single physical antenna to enable user-specific down tilt, then adaptability and signal optimization are improved, but baseband digital signal processing requirements increase
Solution Approach 1:
The patent implements dynamic beamforming where virtual antennas can adapt their radiation patterns in real-time based on user equipment positions and channel conditions. This dynamic adaptability allows the system to optimize signal quality for each user without requiring excessive baseband processing, as the beamforming weights are adjusted based on feedback from user equipment regarding preferred down tilt angles.
4Area of stationary object
If beam forming with multiple antennas is used to increase cell coverage, then coverage area is improved, but system complexity increases
Solution Approach 1:
The patent extends beamforming from traditional two-dimensional horizontal plane to three-dimensional space by incorporating vertical dimension through user-specific down tilt. This dimensional extension allows the system to cover different spatial zones more effectively, increasing cell coverage area while managing system complexity through the virtual antenna abstraction that simplifies the control of multiple physical antenna elements.
Data Source
AI summary
Systems and methods for user specific antenna down tilt in wireless cellular networks are disclosed. A preferred embodiment method comprises synthesizing a plurality of virtual antennas from a single physical antenna, wherein a total number of virtual antennas is less than a total number of antenna elements in the physical antenna, transmitting pilot signals on the plurality of virtual antennas, receiving, from a user equipment, a pre-coding control indicator based on the transmitted pilot signals, determining a multiple-input multiple output pre-coding vector based on the pre-coding control indicator, and transmitting user data modulated by the pre-coding vector to the user equipment via the plurality of virtual antennas.